I have a non CC Quadrajet that I want to learn more about. The numbers on it are 7029202(top) and M8 DH (bottom) Im fairly sure this means 1969, Chevrolet engine, but I want to know what type of vehicle, cfm rating etc. It also seems to be a manual choke, are there actually manual choke Q-jets? Would this be a good carburetor for a 350? I currently have the computer stuff but i want to install a much larger cam, one the computer would throw a fit if I put it in. Thanks in advance.

 

You're right, it's a 69 350 carb. Don't know what the "CFM rating" is, don't care, it's a Q-Jet. It doesn't matter what the "rating" is, it's meaningless anyway. It's fine for a 350 though; it should flow about 730-780 CFM depending on how the secondaries are set up, which is plenty. You're right, it's not manual choke, there's no such thing as a manual choke Q-Jet; it's what they call "divorced choke", where the choke stat mounts in a little well in the intake. It hooks up to the carb with a little linkage that never seems to exist on cars, I always make it from muffler brackets (ummm, excuse me, coat hanger wire). That carb has large enough idle passages to actually work passably well with a large cam, especially on a somewhat larger motor that will still pull some vacuum. It is an excellent carb for a 350.

Good luck with it, it's one of the best cores there is as a starting point for a performance Q-Jet. Alot of the guys that run SCCA and the like run Q-Jets because they either have to, or because the fuel level doesn't change as much when cornering and braking (a major weakness of Holleys.

No Q-Jet will work with less than about 13 or 14 in of vacuum though, be careful with how much cam you stab in your motor if you want it to retain really good driveability.

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"So many Mustangs, so little time..."
ICON Motorsports

 

That carb is off of either a '69 Chevelle or '69 El-Camino and it was off of a 350 engine and the car had AC... It's probably rated around 750 CFM.. that I don't know for sure.

One other thing, you will need a vacuum advance distributer if you go with that carb.

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1984 Firebird - Daily driver, 305 LG4, T5 - Hurst short shifter, Edelbrock 600 CFM Performer Carb - Edelbrock Pro-Flow air filter, gutted cat, IROC 16x8 Wheels, Goodyear P215/60/R16, AIWA bargain basement (from Sears of course) CD player, Fuzzy dice, Eight-ball shift ****
Check out my ride here $1600!! Bye Bye on board computer!

[This message has been edited by ChillPhatCat (edited August 31, 2001).]

 

Thank you both for the quick responses. And for ChillPhatCat: 1)I knew about the distributor, but thanks and 2) Where do you get your Q-jet info? I am very curious because i have been able to find very little usable info.

 

My secret is probably so obvious that few people have ever tried it... you can find info on practically any carb (at least rochesters) by putting the carb number into a search engine, altavista, google etc.